Improvement in propellers



c F. MILLER & Ml PRIESTER.

Improvement in Propellers.

Patented June 11, 1872.

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APn o 00. /v. r (osaakuz's P806558) NITED STATES PATENT OFFICE.

CHRISTIAN F. MILLER AND MANNUS PRIESTEB, OF NEW YORK, N. Y.

I IMPROVEMENT m PROPELLERS.

Specification forming part of Letters Patent No. 127,909, dated June 11, 1872.

To all whom it may concern:

Be it known that we, CHRISTIAN F. MILLER and MANNUS PRIESTER, both of the city, county, and State of New York, have invented a new and useful Improvement in Propellers; and we do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, and in which drawing Figure 1 is a plan or top view of a boat with our invention applied thereto. Fig. 2 is a side view of the same.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of propeller-arms upon the ends of the main shaft, which is placed transversely on the boat, and extends through and beyond the gunwale of the same, said arms being made to pass loosely through said shaft and carrying a bevel-wheel, which gears into a circular stationary rack arranged upon opposite sides of the boat in such a manner that when the main shaft is turned motion is imparted to said propellerarms, and at the same time, by the action of the bevel-wheels, said arms are caused to revolve, so that the propeller-blades, which are secured to the ends of said arms, will present no bearing-surface until they are fairly immersed in the water, and consequently no power is lost by our propeller.

In the drawing, the letter A designates a shaft, which is placed transversely on the boat B, and which passes through and beyond the gunwale O, which forms a bearingfor the same.

Upon opposite sides of the boat we have secured a plate, a, to which is secured a circa lar rack or stationary bevel-wheel, b. D are propellerarms, to which are secured propellerblades 0, and which pass loosely through the shaft A at right angles thereto, as seen in sec tion in Fig. 1. On the arms D are mounted bevel-wheels d, which gear into the stationary bevel-Wheels 1), arranged upon the plate a, as already described. The propellerarms are prevented from dropping out of the shaft A on one side by the bevel-Wheel d, and onthe opposite side by a collar, 0, formed on the arms D.

When the shaft A is turned the propellerarms are caused to turn with it; and by the action of the bevel-wheel d a revolving motion is imparted to the same, and thereby the propeller-blades 0 will not present any bearingsurface to the water until they are at an angle of forty-five degrees to the shaft, or until theyare fairly immersed in the water, and consequently all the power supplied to my propeller is employed for the purpose intended, and none is wasted or lost.

We do not claim, broadly, a bevel-wheel arranged on a propeller-arm which has a rotary motion imparted to the same by meshing with a bevel-wheel on the side of a vessel, as such is not new; but

What we claim as new, and desire to secure by Letters Patent, is

The propeller-arms D arranged loosely within openings in the shaft A, and confined therein by the collar 0 and bevel-wheel d, as described, in combination with the bevel-wheel b, rigidly secured upon the plate a, which is secured to the sides of the vessel, all constructed and operating as and for'the purpose set forth.

This specification signed by us this 20th day of March, 1872. V

CHRISTIAN F. MILLER. DR. MANNUS PRIESTER. Witnesses:

W. HAUFF, E. F. KASTENHUBER. 

